Abstract
This paper mainly studies the heat transfer performance of backplane micro-channel heat pipes by establishing a steady-state numerical model. Compared with the experimental data, the heat transfer characteristics under different structure parameters and operating parameters were studied, and the change of heat transfer coefficient inside the system, the air outlet temperature of the back plate and the influence of different environmental factors on the heat transfer performance of the system were analyzed. The results show that the overall error between simulation results and experimental data is less than 10%. In the range of the optimal filling rate (FR = 64.40%–73.60%), the outlet temperature at the lowest point and the highest point of the evaporation section is 22.46 °C and 19.60 °C, the temperature difference does not exceed 3 °C, and the distribution gradient in vertical height is small and the air outlet temperature is uniform. The heat transfer coefficient between the evaporator and the condenser is larger than the heat transfer coefficient under the conditions of low and high liquid charge rate. It increases gradually along the flow direction, and decreases gradually with the flow rate of the condenser. When the width of the flat tube of the evaporator increases from 20 mm to 28 mm, the internal pressure drop of the evaporator decreases by 45.83% and the heat exchange increases by 18.34%. When the number of evaporator slices increases from 16 to 24, the heat transfer increases first and then decreases, with an overall decrease of 2.86% and an increase of 87.67% in the internal pressure drop of the evaporator. The inclination angle of the corrugation changes from 30° to 60°, and the heat transfer capacity and pressure drop increase. After the inclination angle is greater than 60°, the heat transfer capacity and resistance decrease. The results are of great significance to system optimization design and engineering practical application.
Highlights
With the rapid development of the Internet, the new generation of information technology, represented by big data, cloud computing, artificial intelligence and block chain, is accelerating the global intelligent transformation and promoting the substantial growth of data centers
Yuan [13] studied the micro-channel separated type heat pipe for experiments and simulations; it was concluded that the system was the optimal filling rate, and other working conditions of heat-exchange performance parameters and structure parameters and the influence of flow resistance, but the experimental value of mass flow and the simulation value of maximum relative error was 17.8%, to ignore the thermal resistance of the tube and tube inside and outside will have a direct impact on the heat exchange system, leading to a large data gap
Jin [15,16] studied the micro-channel separated heat pipe with R134a as the medium, and the results showed that the temperature difference between 20 ◦ C and 10 ◦ C increased the heat exchange by 106%, and the height difference between 1.2 m and 0.75 m increased by 267%
Summary
With the rapid development of the Internet, the new generation of information technology, represented by big data, cloud computing, artificial intelligence and block chain, is accelerating the global intelligent transformation and promoting the substantial growth of data centers. The research showed that under the optimal liquid filling rate, with the increase of the temperature difference between indoor and outdoor, the heat exchange and energy efficiency ratio gradually increased. Yuan [13] studied the micro-channel separated type heat pipe for experiments and simulations; it was concluded that the system was the optimal filling rate, and other working conditions of heat-exchange performance parameters and structure parameters and the influence of flow resistance, but the experimental value of mass flow and the simulation value of maximum relative error was 17.8%, to ignore the thermal resistance of the tube and tube inside and outside will have a direct impact on the heat exchange system, leading to a large data gap. The comparative content includes the total heat transfer, import and export of evaporator and condenser parameters such as temperature and pressure, mass flow system, at the same time to simulate the different structural parameters and operation parameters of heat transfer, provide guidance for the application of practical engineering
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